Kerberos transaction over TCP

[Ashutosh]

Hi,
I am trying to get kerberos transaction over tcp, but my linux client
isnt shifting from UDP to TCP.
Somehow I have to force my kerberos transaction to be on TCP.
As my KDC I am using Windows 2000 server and linux client using MIT
distribution.
I have also changed the default value of allowable packet size for UDP
to 1 on windows 2000 server[through registry settings].

I have been looking online but with little success.
Thanks in advance.